What must a player do when taking a relief drop?

When taking a relief drop, the player may substitute a ball. This option is correct because the Rules of Golf allow a player to replace their original ball with a different ball when taking relief under certain conditions, such as an unplayable lie or when taking relief from penalty areas. The new ball must be similar in type and conforms to the rules regarding ball specification.

The ability to substitute a ball enables players to maintain the integrity of play, especially if the original ball is damaged or lost. The key factor is that the player adheres to the specific relief procedures dictated by the rule applicable to their situation, ensuring that they place the new ball in the correct location for the drop.

In contrast, using the same ball is not mandatory; players do not have to keep their original ball if they choose to replace it. Furthermore, there is no requirement to always select the farthest ball, as the player's choice of the drop location must abide by the given rules of the specific relief situation. Asking an opponent for permission is not relevant in the context of taking relief, as it is a procedural action that aligns with the player's own discretion and understanding of the rules.